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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f523ecb4a2767137a7a7049aec3c7f3cfd012ac5fe16df8a62692a7eda3811e' 
  AND token = 'JU5hHwGzu7LWwHVjSk1cac3XV9l9Nt9mNoSHfYA9w7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}